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Dynamic ventriculography in patients with ischaemic heart disease. II. Influence of postextrasystolic potentiation on
Insights
Postextrasystolic potentiation [PESP] significantly improves left ventricular [LV] function in patients with ischemic heart disease. This effect enhances both segmental and global LV contractility, offering insights for myocardial revascularization strategies.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Ischemic heart disease often impairs left ventricular [LV] function.
- Postextrasystolic potentiation [PESP] is a phenomenon where a contraction following a premature beat is stronger.
Purpose of the Study:
- To assess the effect of PESP on LV function in patients with ischemic heart disease.
- To evaluate PESP's potential for predicting the impact of myocardial revascularization.
Main Methods:
- Left ventricular cineangiography was performed in 26 patients.
- Ventricular extrasystoles were induced via catheter in the LV.
- Segmental and global LV function parameters were compared between potentiated and non-potentiated beats.
Main Results:
- PESP improved or resolved segmental LV function disturbances in 8 of 13 affected patients.
- Improvements in contraction were observed even in segments with normal resting function.
- Global LV function significantly improved post-extrasystole, without necessarily increasing LV end-diastolic volume.
Conclusions:
- PESP can significantly enhance LV function in ischemic heart disease.
- This potentiation effect may be a valuable indicator for assessing potential benefits of myocardial revascularization.
- The method has potential advantages and limitations for preoperative LV function estimation.
Abstract:
The effect of postextrasystolic potentiation [PESP] on left ventricular [LV] function was assessed by means of left ventricular cineangiography in 26 patients with ischaemic heart disease. Ventricular extrasystoles were induced by a catheter inserted into the LV during injection of the contrast agent. The values of parameters of segmental and global function of LV, found in potentiated and nonpotentiated sinus contractions, were compared. Segmental disturbances present at rest in 13 patients improved or disappeared after extrasystole in 8 patients. Improvements in contraction also took place in segments with normal resting contraction. Global LV function improved significantly; an improvement was observed even without an increase in the LV end-diastolic volume in the postextrasystolic beat. The advantages and limitations of the method for preoperative estimation of the effect of intended myocardial revascularization on the LV function are discussed.